INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal
Current	$ 0	$ 130	$ 9,591
Deferred	32,652	26,603	15,374
Total	32,652	26,733	24,965
State
Current	3	2	1,706
Deferred	707	81	(1,382)
Total	710	83	324
Total income tax expense
Current	3	132	11,297
Deferred	33,359	26,684	13,992
Total income tax	$ 33,362	$ 26,816	$ 25,289